Does it mean the payment made with the extension to file, or the amount of that payment that ended up applying to 2017 taxes? (Which was less than the payment with the extension to file.) The wording is ambiguous. If it simply meant the amount that you paid, why wouldn't it say that. But Turbotax remembered from my history the payment I made and put in $2k into the field.
In other words, I paid $2k with the extension just to be safe I didn't underpay, but ended up getting a refund for all of that and more. Do I put in $2k or $0 into that entry?